most of the time if the seller doesnt know anything about it, avoid it. that means it is most likely not in their name legally.
I always peruse CL and FM.
Are all the connections shiny enough your mother in law would eat off them
A simple DVM is all that is needed beyond a visual inspection of the circuit breaker
Being 1985, it will be an AQ205 or AQ230
The main breaker is past its life. Check that. Also, check the battery connections and the main harness connector (trapezoid shaped connector)
Remember, the great lakes take no quarter and dont give up the dead.
The worst seas I have been in was deaths door (between the peninsula and Washington island) when the wind shifted.
The 4160 was originally an economy carb. I'm not a big fan personally
Some people like to block off the PV and increase jet sizes on the secondaries by 6 or 7 sizes. This is usually done by the quarter mile crowd. However you loose mid-range drivability.
You will notice that most of the...
The 2.5 opens at 2.5 " of vacuum or below. The 4.5 opens at 4.5" and below.
As the PV opens the PVCR jets add fuel. About 6-7 jet sizes worth. The 4.3 will use that extra fuel just before WOT. The 3.0 won't need the extra fuel until WOT.
Running the 2.5 vs a 4.5 just richens up the mix...
That's an AQ series drive.
The 6 bolts you indicate are the clamp ring bolts holding the PDS in the transom shield
Get a factory service manual
Here is the process of swapping PDS bearings. https://forums.iboats.com/threads/pds-shaft-issues.687012/
Pry out old seal. Measure shaft OD (seal ID), the housing ID (seal OD) and the seal thickness
Then look at a CR seal catalog and order a replacement seal
